2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/log.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/rational.h"
38 #include "libavcodec/version.h"
41 * Identify the syntax and semantics of the bitstream.
42 * The principle is roughly:
43 * Two decoders with the same ID can decode the same streams.
44 * Two encoders with the same ID can encode compatible streams.
45 * There may be slight deviations from the principle due to implementation
48 * If you add a codec ID to this list, add it so that
49 * 1. no value of a existing codec ID changes (that would break ABI),
50 * 2. it is as close as possible to similar codecs.
57 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
58 CODEC_ID_MPEG2VIDEO_XVMC,
95 CODEC_ID_INTERPLAY_VIDEO,
107 CODEC_ID_TRUEMOTION1,
134 CODEC_ID_TRUEMOTION2,
151 CODEC_ID_DSICINVIDEO,
152 CODEC_ID_TIERTEXSEQVIDEO,
161 CODEC_ID_BETHSOFTVID,
179 CODEC_ID_MOTIONPIXELS,
197 CODEC_ID_IFF_BYTERUN1,
213 /* various PCM "codecs" */
214 CODEC_ID_PCM_S16LE= 0x10000,
230 CODEC_ID_PCM_S24DAUD,
232 CODEC_ID_PCM_S16LE_PLANAR,
242 /* various ADPCM codecs */
243 CODEC_ID_ADPCM_IMA_QT= 0x11000,
244 CODEC_ID_ADPCM_IMA_WAV,
245 CODEC_ID_ADPCM_IMA_DK3,
246 CODEC_ID_ADPCM_IMA_DK4,
247 CODEC_ID_ADPCM_IMA_WS,
248 CODEC_ID_ADPCM_IMA_SMJPEG,
257 CODEC_ID_ADPCM_YAMAHA,
258 CODEC_ID_ADPCM_SBPRO_4,
259 CODEC_ID_ADPCM_SBPRO_3,
260 CODEC_ID_ADPCM_SBPRO_2,
262 CODEC_ID_ADPCM_IMA_AMV,
263 CODEC_ID_ADPCM_EA_R1,
264 CODEC_ID_ADPCM_EA_R3,
265 CODEC_ID_ADPCM_EA_R2,
266 CODEC_ID_ADPCM_IMA_EA_SEAD,
267 CODEC_ID_ADPCM_IMA_EA_EACS,
268 CODEC_ID_ADPCM_EA_XAS,
269 CODEC_ID_ADPCM_EA_MAXIS_XA,
270 CODEC_ID_ADPCM_IMA_ISS,
274 CODEC_ID_AMR_NB= 0x12000,
277 /* RealAudio codecs*/
278 CODEC_ID_RA_144= 0x13000,
281 /* various DPCM codecs */
282 CODEC_ID_ROQ_DPCM= 0x14000,
283 CODEC_ID_INTERPLAY_DPCM,
288 CODEC_ID_MP2= 0x15000,
289 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
307 CODEC_ID_WESTWOOD_SND1,
308 CODEC_ID_GSM, ///< as in Berlin toast format
316 CODEC_ID_DSICINAUDIO,
320 CODEC_ID_GSM_MS, /* as found in WAV */
329 CODEC_ID_WMALOSSLESS,
338 CODEC_ID_BINKAUDIO_RDFT,
339 CODEC_ID_BINKAUDIO_DCT,
344 /* subtitle codecs */
345 CODEC_ID_DVD_SUBTITLE= 0x17000,
346 CODEC_ID_DVB_SUBTITLE,
347 CODEC_ID_TEXT, ///< raw UTF-8 text
351 CODEC_ID_HDMV_PGS_SUBTITLE,
352 CODEC_ID_DVB_TELETEXT,
356 /* other specific kind of codecs (generally used for attachments) */
357 CODEC_ID_TTF= 0x18000,
359 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
361 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
362 * stream (only used by libavformat) */
363 CODEC_ID_FFMETADATA=0x21000, ///< Dummy codec for streams containing only metadata information.
366 #if FF_API_OLD_SAMPLE_FMT
367 #define SampleFormat AVSampleFormat
369 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
370 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
371 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
372 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
373 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
374 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
375 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
378 #if FF_API_OLD_AUDIOCONVERT
379 #include "libavutil/audioconvert.h"
381 /* Audio channel masks */
382 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
383 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
384 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
385 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
386 #define CH_BACK_LEFT AV_CH_BACK_LEFT
387 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
388 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
389 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
390 #define CH_BACK_CENTER AV_CH_BACK_CENTER
391 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
392 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
393 #define CH_TOP_CENTER AV_CH_TOP_CENTER
394 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
395 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
396 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
397 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
398 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
399 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
400 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
401 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
403 /** Channel mask value used for AVCodecContext.request_channel_layout
404 to indicate that the user requests the channel order of the decoder output
405 to be the native codec channel order. */
406 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
408 /* Audio channel convenience macros */
409 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
410 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
411 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
412 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
413 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
414 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
415 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
416 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
417 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
418 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
419 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
420 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
421 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
422 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
423 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
427 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
430 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
431 * This is mainly needed because some optimized bitstream readers read
432 * 32 or 64 bit at once and could read over the end.<br>
433 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
434 * MPEG bitstreams could cause overread and segfault.
436 #define FF_INPUT_BUFFER_PADDING_SIZE 16
439 * minimum encoding buffer size
440 * Used to avoid some checks during header writing.
442 #define FF_MIN_BUFFER_SIZE 16384
446 * motion estimation type.
449 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
453 ME_EPZS, ///< enhanced predictive zonal search
454 ME_X1, ///< reserved for experiments
455 ME_HEX, ///< hexagon based search
456 ME_UMH, ///< uneven multi-hexagon search
457 ME_ITER, ///< iterative search
458 ME_TESA, ///< transformed exhaustive search algorithm
462 /* We leave some space between them for extensions (drop some
463 * keyframes for intra-only or drop just some bidir frames). */
464 AVDISCARD_NONE =-16, ///< discard nothing
465 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
466 AVDISCARD_NONREF = 8, ///< discard all non reference
467 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
468 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
469 AVDISCARD_ALL = 48, ///< discard all
472 enum AVColorPrimaries{
473 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
474 AVCOL_PRI_UNSPECIFIED=2,
476 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
477 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
478 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
480 AVCOL_PRI_NB , ///< Not part of ABI
483 enum AVColorTransferCharacteristic{
484 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
485 AVCOL_TRC_UNSPECIFIED=2,
486 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
487 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
488 AVCOL_TRC_NB , ///< Not part of ABI
493 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
494 AVCOL_SPC_UNSPECIFIED=2,
496 AVCOL_SPC_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
497 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
498 AVCOL_SPC_SMPTE240M =7,
499 AVCOL_SPC_NB , ///< Not part of ABI
503 AVCOL_RANGE_UNSPECIFIED=0,
504 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
505 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
506 AVCOL_RANGE_NB , ///< Not part of ABI
510 * X X 3 4 X X are luma samples,
511 * 1 2 1-6 are possible chroma positions
512 * X X 5 6 X 0 is undefined/unknown position
514 enum AVChromaLocation{
515 AVCHROMA_LOC_UNSPECIFIED=0,
516 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
517 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
518 AVCHROMA_LOC_TOPLEFT =3, ///< DV
520 AVCHROMA_LOC_BOTTOMLEFT =5,
521 AVCHROMA_LOC_BOTTOM =6,
522 AVCHROMA_LOC_NB , ///< Not part of ABI
525 #if FF_API_FLAC_GLOBAL_OPTS
529 attribute_deprecated enum AVLPCType {
530 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
531 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
532 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
533 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
534 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
535 AV_LPC_TYPE_NB , ///< Not part of ABI
539 enum AVAudioServiceType {
540 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
541 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
542 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
543 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
544 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
545 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
546 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
547 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
548 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
549 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
552 typedef struct RcOverride{
555 int qscale; // If this is 0 then quality_factor will be used instead.
556 float quality_factor;
559 #define FF_MAX_B_FRAMES 16
562 These flags can be passed in AVCodecContext.flags before initialization.
563 Note: Not everything is supported yet.
566 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
567 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
568 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
569 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
570 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
571 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
573 * The parent program guarantees that the input for B-frames containing
574 * streams is not written to for at least s->max_b_frames+1 frames, if
575 * this is not set the input will be copied.
577 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
578 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
579 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
580 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
581 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
582 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
583 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
584 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
585 location instead of only at frame boundaries. */
586 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
587 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
588 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
589 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
590 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
591 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
592 /* Fx : Flag for h263+ extra options */
593 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
594 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
595 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
596 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
597 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
598 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
599 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
600 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
601 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
602 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
603 #define CODEC_FLAG_CLOSED_GOP 0x80000000
604 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
605 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
606 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
607 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
608 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
609 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
610 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
611 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
612 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
613 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
614 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
615 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
616 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
617 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
618 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
619 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
620 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
621 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
622 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
623 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
624 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
625 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
627 /* Unsupported options :
628 * Syntax Arithmetic coding (SAC)
629 * Reference Picture Selection
630 * Independent Segment Decoding */
632 /* codec capabilities */
634 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
636 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
637 * If not set, it might not use get_buffer() at all or use operations that
638 * assume the buffer was allocated by avcodec_default_get_buffer.
640 #define CODEC_CAP_DR1 0x0002
641 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
642 #define CODEC_CAP_PARSE_ONLY 0x0004
643 #define CODEC_CAP_TRUNCATED 0x0008
644 /* Codec can export data for HW decoding (XvMC). */
645 #define CODEC_CAP_HWACCEL 0x0010
647 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
648 * If this is not set, the codec is guaranteed to never be fed with NULL data.
650 #define CODEC_CAP_DELAY 0x0020
652 * Codec can be fed a final frame with a smaller size.
653 * This can be used to prevent truncation of the last audio samples.
655 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
657 * Codec can export data for HW decoding (VDPAU).
659 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
661 * Codec can output multiple frames per AVPacket
662 * Normally demuxers return one frame at a time, demuxers which do not do
663 * are connected to a parser to split what they return into proper frames.
664 * This flag is reserved to the very rare category of codecs which have a
665 * bitstream that cannot be split into frames without timeconsuming
666 * operations like full decoding. Demuxers carring such bitstreams thus
667 * may return multiple frames in a packet. This has many disadvantages like
668 * prohibiting stream copy in many cases thus it should only be considered
671 #define CODEC_CAP_SUBFRAMES 0x0100
673 * Codec is experimental and is thus avoided in favor of non experimental
676 #define CODEC_CAP_EXPERIMENTAL 0x0200
678 * Codec should fill in channel configuration and samplerate instead of container
680 #define CODEC_CAP_CHANNEL_CONF 0x0400
683 * Codec is able to deal with negative linesizes
685 #define CODEC_CAP_NEG_LINESIZES 0x0800
688 * Codec supports frame-level multithreading.
690 #define CODEC_CAP_FRAME_THREADS 0x1000
692 * Codec supports slice-based (or partition-based) multithreading.
694 #define CODEC_CAP_SLICE_THREADS 0x2000
698 #define CODEC_CAP_LOSSLESS 0x80000000
700 //The following defines may change, don't expect compatibility if you use them.
701 #define MB_TYPE_INTRA4x4 0x0001
702 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
703 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
704 #define MB_TYPE_16x16 0x0008
705 #define MB_TYPE_16x8 0x0010
706 #define MB_TYPE_8x16 0x0020
707 #define MB_TYPE_8x8 0x0040
708 #define MB_TYPE_INTERLACED 0x0080
709 #define MB_TYPE_DIRECT2 0x0100 //FIXME
710 #define MB_TYPE_ACPRED 0x0200
711 #define MB_TYPE_GMC 0x0400
712 #define MB_TYPE_SKIP 0x0800
713 #define MB_TYPE_P0L0 0x1000
714 #define MB_TYPE_P1L0 0x2000
715 #define MB_TYPE_P0L1 0x4000
716 #define MB_TYPE_P1L1 0x8000
717 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
718 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
719 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
720 #define MB_TYPE_QUANT 0x00010000
721 #define MB_TYPE_CBP 0x00020000
722 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
726 * This specifies the area which should be displayed.
727 * Note there may be multiple such areas for one frame.
729 typedef struct AVPanScan{
732 * - encoding: Set by user.
733 * - decoding: Set by libavcodec.
738 * width and height in 1/16 pel
739 * - encoding: Set by user.
740 * - decoding: Set by libavcodec.
746 * position of the top left corner in 1/16 pel for up to 3 fields/frames
747 * - encoding: Set by user.
748 * - decoding: Set by libavcodec.
750 int16_t position[3][2];
753 #define FF_QSCALE_TYPE_MPEG1 0
754 #define FF_QSCALE_TYPE_MPEG2 1
755 #define FF_QSCALE_TYPE_H264 2
756 #define FF_QSCALE_TYPE_VP56 3
758 #define FF_BUFFER_TYPE_INTERNAL 1
759 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
760 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
761 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
763 #if FF_API_OLD_FF_PICT_TYPES
764 /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
765 #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
766 #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
767 #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
768 #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
769 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
770 #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
771 #define FF_BI_TYPE AV_PICTURE_TYPE_BI
774 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
775 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
776 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
777 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
779 enum AVPacketSideDataType {
783 typedef struct AVPacket {
785 * Presentation timestamp in AVStream->time_base units; the time at which
786 * the decompressed packet will be presented to the user.
787 * Can be AV_NOPTS_VALUE if it is not stored in the file.
788 * pts MUST be larger or equal to dts as presentation cannot happen before
789 * decompression, unless one wants to view hex dumps. Some formats misuse
790 * the terms dts and pts/cts to mean something different. Such timestamps
791 * must be converted to true pts/dts before they are stored in AVPacket.
795 * Decompression timestamp in AVStream->time_base units; the time at which
796 * the packet is decompressed.
797 * Can be AV_NOPTS_VALUE if it is not stored in the file.
805 * Additional packet data that can be provided by the container.
806 * Packet can contain several types of side information.
811 enum AVPacketSideDataType type;
816 * Duration of this packet in AVStream->time_base units, 0 if unknown.
817 * Equals next_pts - this_pts in presentation order.
820 void (*destruct)(struct AVPacket *);
822 int64_t pos; ///< byte position in stream, -1 if unknown
825 * Time difference in AVStream->time_base units from the pts of this
826 * packet to the point at which the output from the decoder has converged
827 * independent from the availability of previous frames. That is, the
828 * frames are virtually identical no matter if decoding started from
829 * the very first frame or from this keyframe.
830 * Is AV_NOPTS_VALUE if unknown.
831 * This field is not the display duration of the current packet.
832 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
835 * The purpose of this field is to allow seeking in streams that have no
836 * keyframes in the conventional sense. It corresponds to the
837 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
838 * essential for some types of subtitle streams to ensure that all
839 * subtitles are correctly displayed after seeking.
841 int64_t convergence_duration;
843 #define AV_PKT_FLAG_KEY 0x0001
847 * New fields can be added to the end of AVFRAME with minor version
848 * bumps. Removal, reordering and changes to existing fields require
849 * a major version bump.
850 * sizeof(AVFrame) must not be used outside libav*.
852 typedef struct AVFrame {
854 * pointer to the picture planes.
855 * This might be different from the first allocated byte
862 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
863 * This isn't used by libavcodec unless the default get/release_buffer() is used.
869 * 1 -> keyframe, 0-> not
870 * - encoding: Set by libavcodec.
871 * - decoding: Set by libavcodec.
876 * Picture type of the frame, see ?_TYPE below.
877 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
878 * - decoding: Set by libavcodec.
880 enum AVPictureType pict_type;
883 * presentation timestamp in time_base units (time when frame should be shown to user)
884 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
885 * - encoding: MUST be set by user.
886 * - decoding: Set by libavcodec.
891 * picture number in bitstream order
893 * - decoding: Set by libavcodec.
895 int coded_picture_number;
897 * picture number in display order
899 * - decoding: Set by libavcodec.
901 int display_picture_number;
904 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
905 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
906 * - decoding: Set by libavcodec.
911 * buffer age (1->was last buffer and dint change, 2->..., ...).
912 * Set to INT_MAX if the buffer has not been used yet.
914 * - decoding: MUST be set by get_buffer().
919 * is this picture used as reference
920 * The values for this are the same as the MpegEncContext.picture_structure
921 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
922 * Set to 4 for delayed, non-reference frames.
924 * - decoding: Set by libavcodec. (before get_buffer() call)).
931 * - decoding: Set by libavcodec.
933 int8_t *qscale_table;
937 * - decoding: Set by libavcodec.
942 * mbskip_table[mb]>=1 if MB didn't change
943 * stride= mb_width = (width+15)>>4
945 * - decoding: Set by libavcodec.
947 uint8_t *mbskip_table;
950 * motion vector table
953 * int mv_sample_log2= 4 - motion_subsample_log2;
954 * int mb_width= (width+15)>>4;
955 * int mv_stride= (mb_width << mv_sample_log2) + 1;
956 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
958 * - encoding: Set by user.
959 * - decoding: Set by libavcodec.
961 int16_t (*motion_val[2])[2];
964 * macroblock type table
965 * mb_type_base + mb_width + 2
966 * - encoding: Set by user.
967 * - decoding: Set by libavcodec.
972 * log2 of the size of the block which a single vector in motion_val represents:
973 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
975 * - decoding: Set by libavcodec.
977 uint8_t motion_subsample_log2;
980 * for some private data of the user
982 * - decoding: Set by user.
988 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
994 * type of the buffer (to keep track of who has to deallocate data[*])
995 * - encoding: Set by the one who allocates it.
996 * - decoding: Set by the one who allocates it.
997 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1002 * When decoding, this signals how much the picture must be delayed.
1003 * extra_delay = repeat_pict / (2*fps)
1004 * - encoding: unused
1005 * - decoding: Set by libavcodec.
1015 * The content of the picture is interlaced.
1016 * - encoding: Set by user.
1017 * - decoding: Set by libavcodec. (default 0)
1019 int interlaced_frame;
1022 * If the content is interlaced, is top field displayed first.
1023 * - encoding: Set by user.
1024 * - decoding: Set by libavcodec.
1026 int top_field_first;
1030 * - encoding: Set by user.
1031 * - decoding: Set by libavcodec.
1033 AVPanScan *pan_scan;
1036 * Tell user application that palette has changed from previous frame.
1037 * - encoding: ??? (no palette-enabled encoder yet)
1038 * - decoding: Set by libavcodec. (default 0).
1040 int palette_has_changed;
1043 * codec suggestion on buffer type if != 0
1044 * - encoding: unused
1045 * - decoding: Set by libavcodec. (before get_buffer() call)).
1051 * - encoding: unused
1052 * - decoding: Set by libavcodec.
1057 * motion reference frame index
1058 * the order in which these are stored can depend on the codec.
1059 * - encoding: Set by user.
1060 * - decoding: Set by libavcodec.
1062 int8_t *ref_index[2];
1065 * reordered opaque 64bit (generally an integer or a double precision float
1066 * PTS but can be anything).
1067 * The user sets AVCodecContext.reordered_opaque to represent the input at
1069 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1070 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1071 * @deprecated in favor of pkt_pts
1072 * - encoding: unused
1073 * - decoding: Read by user.
1075 int64_t reordered_opaque;
1078 * hardware accelerator private data (FFmpeg-allocated)
1079 * - encoding: unused
1080 * - decoding: Set by libavcodec
1082 void *hwaccel_picture_private;
1085 * reordered pts from the last AVPacket that has been input into the decoder
1086 * - encoding: unused
1087 * - decoding: Read by user.
1092 * dts from the last AVPacket that has been input into the decoder
1093 * - encoding: unused
1094 * - decoding: Read by user.
1099 * the AVCodecContext which ff_thread_get_buffer() was last called on
1100 * - encoding: Set by libavcodec.
1101 * - decoding: Set by libavcodec.
1103 struct AVCodecContext *owner;
1106 * used by multithreading to store frame-specific info
1107 * - encoding: Set by libavcodec.
1108 * - decoding: Set by libavcodec.
1110 void *thread_opaque;
1113 * frame timestamp estimated using various heuristics, in stream time base
1114 * - encoding: unused
1115 * - decoding: set by libavcodec, read by user.
1117 int64_t best_effort_timestamp;
1120 * reordered pos from the last AVPacket that has been input into the decoder
1121 * - encoding: unused
1122 * - decoding: Read by user.
1127 * reordered sample aspect ratio for the video frame, 0/1 if unknown\unspecified
1128 * - encoding: unused
1129 * - decoding: Read by user.
1131 AVRational sample_aspect_ratio;
1134 * width and height of the video frame
1135 * - encoding: unused
1136 * - decoding: Read by user.
1141 * format of the frame, -1 if unknown or unset
1142 * It should be cast to the corresponding enum (enum PixelFormat
1143 * for video, enum AVSampleFormat for audio)
1144 * - encoding: unused
1145 * - decoding: Read by user.
1152 * main external API structure.
1153 * New fields can be added to the end with minor version bumps.
1154 * Removal, reordering and changes to existing fields require a major
1156 * sizeof(AVCodecContext) must not be used outside libav*.
1158 typedef struct AVCodecContext {
1160 * information on struct for av_log
1161 * - set by avcodec_alloc_context
1163 const AVClass *av_class;
1165 * the average bitrate
1166 * - encoding: Set by user; unused for constant quantizer encoding.
1167 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1172 * number of bits the bitstream is allowed to diverge from the reference.
1173 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1174 * - encoding: Set by user; unused for constant quantizer encoding.
1175 * - decoding: unused
1177 int bit_rate_tolerance;
1181 * - encoding: Set by user.
1182 * - decoding: Set by user.
1187 * Some codecs need additional format info. It is stored here.
1188 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1189 * specific codec MUST set it correctly otherwise stream copy breaks.
1190 * In general use of this field by muxers is not recommanded.
1191 * - encoding: Set by libavcodec.
1192 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1197 * Motion estimation algorithm used for video coding.
1198 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1199 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1200 * - encoding: MUST be set by user.
1201 * - decoding: unused
1206 * some codecs need / can use extradata like Huffman tables.
1207 * mjpeg: Huffman tables
1208 * rv10: additional flags
1209 * mpeg4: global headers (they can be in the bitstream or here)
1210 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1211 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1212 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1213 * - encoding: Set/allocated/freed by libavcodec.
1214 * - decoding: Set/allocated/freed by user.
1220 * This is the fundamental unit of time (in seconds) in terms
1221 * of which frame timestamps are represented. For fixed-fps content,
1222 * timebase should be 1/framerate and timestamp increments should be
1224 * - encoding: MUST be set by user.
1225 * - decoding: Set by libavcodec.
1227 AVRational time_base;
1231 * picture width / height.
1232 * - encoding: MUST be set by user.
1233 * - decoding: Set by libavcodec.
1234 * Note: For compatibility it is possible to set this instead of
1235 * coded_width/height before decoding.
1239 #define FF_ASPECT_EXTENDED 15
1242 * the number of pictures in a group of pictures, or 0 for intra_only
1243 * - encoding: Set by user.
1244 * - decoding: unused
1249 * Pixel format, see PIX_FMT_xxx.
1250 * May be set by the demuxer if known from headers.
1251 * May be overriden by the decoder if it knows better.
1252 * - encoding: Set by user.
1253 * - decoding: Set by user if known, overridden by libavcodec if known
1255 enum PixelFormat pix_fmt;
1258 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1259 * decoder to draw a horizontal band. It improves cache usage. Not
1260 * all codecs can do that. You must check the codec capabilities
1262 * When multithreading is used, it may be called from multiple threads
1263 * at the same time; threads might draw different parts of the same AVFrame,
1264 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1266 * The function is also used by hardware acceleration APIs.
1267 * It is called at least once during frame decoding to pass
1268 * the data needed for hardware render.
1269 * In that mode instead of pixel data, AVFrame points to
1270 * a structure specific to the acceleration API. The application
1271 * reads the structure and can change some fields to indicate progress
1273 * - encoding: unused
1274 * - decoding: Set by user.
1275 * @param height the height of the slice
1276 * @param y the y position of the slice
1277 * @param type 1->top field, 2->bottom field, 3->frame
1278 * @param offset offset into the AVFrame.data from which the slice should be read
1280 void (*draw_horiz_band)(struct AVCodecContext *s,
1281 const AVFrame *src, int offset[4],
1282 int y, int type, int height);
1285 int sample_rate; ///< samples per second
1286 int channels; ///< number of audio channels
1289 * audio sample format
1290 * - encoding: Set by user.
1291 * - decoding: Set by libavcodec.
1293 enum AVSampleFormat sample_fmt; ///< sample format
1295 /* The following data should not be initialized. */
1297 * Samples per packet, initialized when calling 'init'.
1300 int frame_number; ///< audio or video frame number
1303 * Number of frames the decoded output will be delayed relative to
1304 * the encoded input.
1305 * - encoding: Set by libavcodec.
1306 * - decoding: unused
1310 /* - encoding parameters */
1311 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1312 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1316 * - encoding: Set by user.
1317 * - decoding: unused
1323 * - encoding: Set by user.
1324 * - decoding: unused
1329 * maximum quantizer difference between frames
1330 * - encoding: Set by user.
1331 * - decoding: unused
1336 * maximum number of B-frames between non-B-frames
1337 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1338 * - encoding: Set by user.
1339 * - decoding: unused
1344 * qscale factor between IP and B-frames
1345 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1346 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1347 * - encoding: Set by user.
1348 * - decoding: unused
1350 float b_quant_factor;
1352 /** obsolete FIXME remove */
1354 #define FF_RC_STRATEGY_XVID 1
1356 int b_frame_strategy;
1358 struct AVCodec *codec;
1362 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1363 /* do its best to deliver a chunk with size */
1364 /* below rtp_payload_size, the chunk will start */
1365 /* with a start code on some codecs like H.263. */
1366 /* This doesn't take account of any particular */
1367 /* headers inside the transmitted RTP payload. */
1370 /* The RTP callback: This function is called */
1371 /* every time the encoder has a packet to send. */
1372 /* It depends on the encoder if the data starts */
1373 /* with a Start Code (it should). H.263 does. */
1374 /* mb_nb contains the number of macroblocks */
1375 /* encoded in the RTP payload. */
1376 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1378 /* statistics, used for 2-pass encoding */
1389 * number of bits used for the previously encoded frame
1390 * - encoding: Set by libavcodec.
1391 * - decoding: unused
1396 * Private data of the user, can be used to carry app specific stuff.
1397 * - encoding: Set by user.
1398 * - decoding: Set by user.
1402 char codec_name[32];
1403 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1404 enum CodecID codec_id; /* see CODEC_ID_xxx */
1407 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1408 * This is used to work around some encoder bugs.
1409 * A demuxer should set this to what is stored in the field used to identify the codec.
1410 * If there are multiple such fields in a container then the demuxer should choose the one
1411 * which maximizes the information about the used codec.
1412 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1413 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1414 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1416 * - encoding: Set by user, if not then the default based on codec_id will be used.
1417 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1419 unsigned int codec_tag;
1422 * Work around bugs in encoders which sometimes cannot be detected automatically.
1423 * - encoding: Set by user
1424 * - decoding: Set by user
1426 int workaround_bugs;
1427 #define FF_BUG_AUTODETECT 1 ///< autodetection
1428 #define FF_BUG_OLD_MSMPEG4 2
1429 #define FF_BUG_XVID_ILACE 4
1430 #define FF_BUG_UMP4 8
1431 #define FF_BUG_NO_PADDING 16
1432 #define FF_BUG_AMV 32
1433 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1434 #define FF_BUG_QPEL_CHROMA 64
1435 #define FF_BUG_STD_QPEL 128
1436 #define FF_BUG_QPEL_CHROMA2 256
1437 #define FF_BUG_DIRECT_BLOCKSIZE 512
1438 #define FF_BUG_EDGE 1024
1439 #define FF_BUG_HPEL_CHROMA 2048
1440 #define FF_BUG_DC_CLIP 4096
1441 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1442 #define FF_BUG_TRUNCATED 16384
1443 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1446 * luma single coefficient elimination threshold
1447 * - encoding: Set by user.
1448 * - decoding: unused
1450 int luma_elim_threshold;
1453 * chroma single coeff elimination threshold
1454 * - encoding: Set by user.
1455 * - decoding: unused
1457 int chroma_elim_threshold;
1460 * strictly follow the standard (MPEG4, ...).
1461 * - encoding: Set by user.
1462 * - decoding: Set by user.
1463 * Setting this to STRICT or higher means the encoder and decoder will
1464 * generally do stupid things, whereas setting it to unofficial or lower
1465 * will mean the encoder might produce output that is not supported by all
1466 * spec-compliant decoders. Decoders don't differentiate between normal,
1467 * unofficial and experimental (that is, they always try to decode things
1468 * when they can) unless they are explicitly asked to behave stupidly
1469 * (=strictly conform to the specs)
1471 int strict_std_compliance;
1472 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1473 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1474 #define FF_COMPLIANCE_NORMAL 0
1475 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1476 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1479 * qscale offset between IP and B-frames
1480 * - encoding: Set by user.
1481 * - decoding: unused
1483 float b_quant_offset;
1486 * Error recognization; higher values will detect more errors but may
1487 * misdetect some more or less valid parts as errors.
1488 * - encoding: unused
1489 * - decoding: Set by user.
1491 int error_recognition;
1492 #define FF_ER_CAREFUL 1
1493 #define FF_ER_COMPLIANT 2
1494 #define FF_ER_AGGRESSIVE 3
1495 #if FF_API_VERY_AGGRESSIVE
1496 #define FF_ER_VERY_AGGRESSIVE 4
1497 #define FF_ER_EXPLODE 5
1499 #define FF_ER_EXPLODE 4
1500 #endif /* FF_API_VERY_AGGRESSIVE */
1503 * Called at the beginning of each frame to get a buffer for it.
1504 * If pic.reference is set then the frame will be read later by libavcodec.
1505 * avcodec_align_dimensions2() should be used to find the required width and
1506 * height, as they normally need to be rounded up to the next multiple of 16.
1507 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1508 * avcodec_default_get_buffer() instead of providing buffers allocated by
1510 * If frame multithreading is used and thread_safe_callbacks is set,
1511 * it may be called from a different thread, but not from more than one at once.
1512 * Does not need to be reentrant.
1513 * - encoding: unused
1514 * - decoding: Set by libavcodec, user can override.
1516 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1519 * Called to release buffers which were allocated with get_buffer.
1520 * A released buffer can be reused in get_buffer().
1521 * pic.data[*] must be set to NULL.
1522 * May be called from a different thread if frame multithreading is used,
1523 * but not by more than one thread at once, so does not need to be reentrant.
1524 * - encoding: unused
1525 * - decoding: Set by libavcodec, user can override.
1527 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1530 * Size of the frame reordering buffer in the decoder.
1531 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1532 * - encoding: Set by libavcodec.
1533 * - decoding: Set by libavcodec.
1538 * number of bytes per packet if constant and known or 0
1539 * Used by some WAV based audio codecs.
1543 int parse_only; /* - decoding only: If true, only parsing is done
1544 (function avcodec_parse_frame()). The frame
1545 data is returned. Only MPEG codecs support this now. */
1548 * 0-> h263 quant 1-> mpeg quant
1549 * - encoding: Set by user.
1550 * - decoding: unused
1555 * pass1 encoding statistics output buffer
1556 * - encoding: Set by libavcodec.
1557 * - decoding: unused
1562 * pass2 encoding statistics input buffer
1563 * Concatenated stuff from stats_out of pass1 should be placed here.
1564 * - encoding: Allocated/set/freed by user.
1565 * - decoding: unused
1570 * ratecontrol qmin qmax limiting method
1571 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1572 * - encoding: Set by user.
1573 * - decoding: unused
1581 * ratecontrol override, see RcOverride
1582 * - encoding: Allocated/set/freed by user.
1583 * - decoding: unused
1585 RcOverride *rc_override;
1586 int rc_override_count;
1589 * rate control equation
1590 * - encoding: Set by user
1591 * - decoding: unused
1597 * - encoding: Set by user.
1598 * - decoding: unused
1604 * - encoding: Set by user.
1605 * - decoding: unused
1610 * decoder bitstream buffer size
1611 * - encoding: Set by user.
1612 * - decoding: unused
1615 float rc_buffer_aggressivity;
1618 * qscale factor between P and I-frames
1619 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1620 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1621 * - encoding: Set by user.
1622 * - decoding: unused
1624 float i_quant_factor;
1627 * qscale offset between P and I-frames
1628 * - encoding: Set by user.
1629 * - decoding: unused
1631 float i_quant_offset;
1634 * initial complexity for pass1 ratecontrol
1635 * - encoding: Set by user.
1636 * - decoding: unused
1638 float rc_initial_cplx;
1641 * DCT algorithm, see FF_DCT_* below
1642 * - encoding: Set by user.
1643 * - decoding: unused
1646 #define FF_DCT_AUTO 0
1647 #define FF_DCT_FASTINT 1
1648 #define FF_DCT_INT 2
1649 #define FF_DCT_MMX 3
1650 #define FF_DCT_MLIB 4
1651 #define FF_DCT_ALTIVEC 5
1652 #define FF_DCT_FAAN 6
1655 * luminance masking (0-> disabled)
1656 * - encoding: Set by user.
1657 * - decoding: unused
1662 * temporary complexity masking (0-> disabled)
1663 * - encoding: Set by user.
1664 * - decoding: unused
1666 float temporal_cplx_masking;
1669 * spatial complexity masking (0-> disabled)
1670 * - encoding: Set by user.
1671 * - decoding: unused
1673 float spatial_cplx_masking;
1676 * p block masking (0-> disabled)
1677 * - encoding: Set by user.
1678 * - decoding: unused
1683 * darkness masking (0-> disabled)
1684 * - encoding: Set by user.
1685 * - decoding: unused
1690 * IDCT algorithm, see FF_IDCT_* below.
1691 * - encoding: Set by user.
1692 * - decoding: Set by user.
1695 #define FF_IDCT_AUTO 0
1696 #define FF_IDCT_INT 1
1697 #define FF_IDCT_SIMPLE 2
1698 #define FF_IDCT_SIMPLEMMX 3
1699 #define FF_IDCT_LIBMPEG2MMX 4
1700 #define FF_IDCT_PS2 5
1701 #define FF_IDCT_MLIB 6
1702 #define FF_IDCT_ARM 7
1703 #define FF_IDCT_ALTIVEC 8
1704 #define FF_IDCT_SH4 9
1705 #define FF_IDCT_SIMPLEARM 10
1706 #define FF_IDCT_H264 11
1707 #define FF_IDCT_VP3 12
1708 #define FF_IDCT_IPP 13
1709 #define FF_IDCT_XVIDMMX 14
1710 #define FF_IDCT_CAVS 15
1711 #define FF_IDCT_SIMPLEARMV5TE 16
1712 #define FF_IDCT_SIMPLEARMV6 17
1713 #define FF_IDCT_SIMPLEVIS 18
1714 #define FF_IDCT_WMV2 19
1715 #define FF_IDCT_FAAN 20
1716 #define FF_IDCT_EA 21
1717 #define FF_IDCT_SIMPLENEON 22
1718 #define FF_IDCT_SIMPLEALPHA 23
1719 #define FF_IDCT_BINK 24
1723 * - encoding: Set by libavcodec.
1724 * - decoding: Set by user (or 0).
1728 * slice offsets in the frame in bytes
1729 * - encoding: Set/allocated by libavcodec.
1730 * - decoding: Set/allocated by user (or NULL).
1735 * error concealment flags
1736 * - encoding: unused
1737 * - decoding: Set by user.
1739 int error_concealment;
1740 #define FF_EC_GUESS_MVS 1
1741 #define FF_EC_DEBLOCK 2
1744 * dsp_mask could be add used to disable unwanted CPU features
1745 * CPU features (i.e. MMX, SSE. ...)
1747 * With the FORCE flag you may instead enable given CPU features.
1748 * (Dangerous: Usable in case of misdetection, improper usage however will
1749 * result into program crash.)
1754 * bits per sample/pixel from the demuxer (needed for huffyuv).
1755 * - encoding: Set by libavcodec.
1756 * - decoding: Set by user.
1758 int bits_per_coded_sample;
1761 * prediction method (needed for huffyuv)
1762 * - encoding: Set by user.
1763 * - decoding: unused
1765 int prediction_method;
1766 #define FF_PRED_LEFT 0
1767 #define FF_PRED_PLANE 1
1768 #define FF_PRED_MEDIAN 2
1771 * sample aspect ratio (0 if unknown)
1772 * That is the width of a pixel divided by the height of the pixel.
1773 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1774 * - encoding: Set by user.
1775 * - decoding: Set by libavcodec.
1777 AVRational sample_aspect_ratio;
1780 * the picture in the bitstream
1781 * - encoding: Set by libavcodec.
1782 * - decoding: Set by libavcodec.
1784 AVFrame *coded_frame;
1788 * - encoding: Set by user.
1789 * - decoding: Set by user.
1792 #define FF_DEBUG_PICT_INFO 1
1793 #define FF_DEBUG_RC 2
1794 #define FF_DEBUG_BITSTREAM 4
1795 #define FF_DEBUG_MB_TYPE 8
1796 #define FF_DEBUG_QP 16
1797 #define FF_DEBUG_MV 32
1798 #define FF_DEBUG_DCT_COEFF 0x00000040
1799 #define FF_DEBUG_SKIP 0x00000080
1800 #define FF_DEBUG_STARTCODE 0x00000100
1801 #define FF_DEBUG_PTS 0x00000200
1802 #define FF_DEBUG_ER 0x00000400
1803 #define FF_DEBUG_MMCO 0x00000800
1804 #define FF_DEBUG_BUGS 0x00001000
1805 #define FF_DEBUG_VIS_QP 0x00002000
1806 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1807 #define FF_DEBUG_BUFFERS 0x00008000
1808 #define FF_DEBUG_THREADS 0x00010000
1812 * - encoding: Set by user.
1813 * - decoding: Set by user.
1816 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1817 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1818 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1822 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1823 * - decoding: unused
1828 * motion estimation comparison function
1829 * - encoding: Set by user.
1830 * - decoding: unused
1834 * subpixel motion estimation comparison function
1835 * - encoding: Set by user.
1836 * - decoding: unused
1840 * macroblock comparison function (not supported yet)
1841 * - encoding: Set by user.
1842 * - decoding: unused
1846 * interlaced DCT comparison function
1847 * - encoding: Set by user.
1848 * - decoding: unused
1851 #define FF_CMP_SAD 0
1852 #define FF_CMP_SSE 1
1853 #define FF_CMP_SATD 2
1854 #define FF_CMP_DCT 3
1855 #define FF_CMP_PSNR 4
1856 #define FF_CMP_BIT 5
1858 #define FF_CMP_ZERO 7
1859 #define FF_CMP_VSAD 8
1860 #define FF_CMP_VSSE 9
1861 #define FF_CMP_NSSE 10
1862 #define FF_CMP_W53 11
1863 #define FF_CMP_W97 12
1864 #define FF_CMP_DCTMAX 13
1865 #define FF_CMP_DCT264 14
1866 #define FF_CMP_CHROMA 256
1869 * ME diamond size & shape
1870 * - encoding: Set by user.
1871 * - decoding: unused
1876 * amount of previous MV predictors (2a+1 x 2a+1 square)
1877 * - encoding: Set by user.
1878 * - decoding: unused
1880 int last_predictor_count;
1883 * prepass for motion estimation
1884 * - encoding: Set by user.
1885 * - decoding: unused
1890 * motion estimation prepass comparison function
1891 * - encoding: Set by user.
1892 * - decoding: unused
1897 * ME prepass diamond size & shape
1898 * - encoding: Set by user.
1899 * - decoding: unused
1905 * - encoding: Set by user.
1906 * - decoding: unused
1908 int me_subpel_quality;
1911 * callback to negotiate the pixelFormat
1912 * @param fmt is the list of formats which are supported by the codec,
1913 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1914 * The first is always the native one.
1915 * @return the chosen format
1916 * - encoding: unused
1917 * - decoding: Set by user, if not set the native format will be chosen.
1919 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1922 * DTG active format information (additional aspect ratio
1923 * information only used in DVB MPEG-2 transport streams)
1926 * - encoding: unused
1927 * - decoding: Set by decoder.
1929 int dtg_active_format;
1930 #define FF_DTG_AFD_SAME 8
1931 #define FF_DTG_AFD_4_3 9
1932 #define FF_DTG_AFD_16_9 10
1933 #define FF_DTG_AFD_14_9 11
1934 #define FF_DTG_AFD_4_3_SP_14_9 13
1935 #define FF_DTG_AFD_16_9_SP_14_9 14
1936 #define FF_DTG_AFD_SP_4_3 15
1939 * maximum motion estimation search range in subpel units
1940 * If 0 then no limit.
1942 * - encoding: Set by user.
1943 * - decoding: unused
1948 * intra quantizer bias
1949 * - encoding: Set by user.
1950 * - decoding: unused
1952 int intra_quant_bias;
1953 #define FF_DEFAULT_QUANT_BIAS 999999
1956 * inter quantizer bias
1957 * - encoding: Set by user.
1958 * - decoding: unused
1960 int inter_quant_bias;
1964 * - encoding: unused
1965 * - decoding: Which clrtable should be used for 8bit RGB images.
1966 * Tables have to be stored somewhere. FIXME
1971 * internal_buffer count
1972 * Don't touch, used by libavcodec default_get_buffer().
1974 int internal_buffer_count;
1978 * Don't touch, used by libavcodec default_get_buffer().
1980 void *internal_buffer;
1983 * Global quality for codecs which cannot change it per frame.
1984 * This should be proportional to MPEG-1/2/4 qscale.
1985 * - encoding: Set by user.
1986 * - decoding: unused
1990 #define FF_CODER_TYPE_VLC 0
1991 #define FF_CODER_TYPE_AC 1
1992 #define FF_CODER_TYPE_RAW 2
1993 #define FF_CODER_TYPE_RLE 3
1994 #define FF_CODER_TYPE_DEFLATE 4
1997 * - encoding: Set by user.
1998 * - decoding: unused
2004 * - encoding: Set by user.
2005 * - decoding: unused
2011 * - encoding: unused
2012 * - decoding: Set by user.
2014 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2019 * - encoding: unused
2020 * - decoding: Set by user.
2023 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2024 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2025 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2028 * XVideo Motion Acceleration
2029 * - encoding: forbidden
2030 * - decoding: set by decoder
2032 int xvmc_acceleration;
2035 * macroblock decision mode
2036 * - encoding: Set by user.
2037 * - decoding: unused
2040 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2041 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2042 #define FF_MB_DECISION_RD 2 ///< rate distortion
2045 * custom intra quantization matrix
2046 * - encoding: Set by user, can be NULL.
2047 * - decoding: Set by libavcodec.
2049 uint16_t *intra_matrix;
2052 * custom inter quantization matrix
2053 * - encoding: Set by user, can be NULL.
2054 * - decoding: Set by libavcodec.
2056 uint16_t *inter_matrix;
2059 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2060 * This is used to work around some encoder bugs.
2061 * - encoding: unused
2062 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2064 unsigned int stream_codec_tag;
2067 * scene change detection threshold
2068 * 0 is default, larger means fewer detected scene changes.
2069 * - encoding: Set by user.
2070 * - decoding: unused
2072 int scenechange_threshold;
2075 * minimum Lagrange multipler
2076 * - encoding: Set by user.
2077 * - decoding: unused
2082 * maximum Lagrange multipler
2083 * - encoding: Set by user.
2084 * - decoding: unused
2088 #if FF_API_PALETTE_CONTROL
2090 * palette control structure
2091 * - encoding: ??? (no palette-enabled encoder yet)
2092 * - decoding: Set by user.
2094 struct AVPaletteControl *palctrl;
2098 * noise reduction strength
2099 * - encoding: Set by user.
2100 * - decoding: unused
2102 int noise_reduction;
2105 * Called at the beginning of a frame to get cr buffer for it.
2106 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2107 * libavcodec will pass previous buffer in pic, function should return
2108 * same buffer or new buffer with old frame "painted" into it.
2109 * If pic.data[0] == NULL must behave like get_buffer().
2110 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2111 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2113 * - encoding: unused
2114 * - decoding: Set by libavcodec, user can override.
2116 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2119 * Number of bits which should be loaded into the rc buffer before decoding starts.
2120 * - encoding: Set by user.
2121 * - decoding: unused
2123 int rc_initial_buffer_occupancy;
2127 * - encoding: Set by user.
2128 * - decoding: unused
2130 int inter_threshold;
2134 * - encoding: Set by user.
2135 * - decoding: Set by user.
2140 * Simulates errors in the bitstream to test error concealment.
2141 * - encoding: Set by user.
2142 * - decoding: unused
2146 #if FF_API_ANTIALIAS_ALGO
2148 * MP3 antialias algorithm, see FF_AA_* below.
2149 * - encoding: unused
2150 * - decoding: Set by user.
2152 attribute_deprecated int antialias_algo;
2153 #define FF_AA_AUTO 0
2154 #define FF_AA_FASTINT 1 //not implemented yet
2156 #define FF_AA_FLOAT 3
2160 * quantizer noise shaping
2161 * - encoding: Set by user.
2162 * - decoding: unused
2164 int quantizer_noise_shaping;
2168 * is used to decide how many independent tasks should be passed to execute()
2169 * - encoding: Set by user.
2170 * - decoding: Set by user.
2175 * The codec may call this to execute several independent things.
2176 * It will return only after finishing all tasks.
2177 * The user may replace this with some multithreaded implementation,
2178 * the default implementation will execute the parts serially.
2179 * @param count the number of things to execute
2180 * - encoding: Set by libavcodec, user can override.
2181 * - decoding: Set by libavcodec, user can override.
2183 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2187 * Can be used by execute() to store some per AVCodecContext stuff.
2188 * - encoding: set by execute()
2189 * - decoding: set by execute()
2191 void *thread_opaque;
2194 * Motion estimation threshold below which no motion estimation is
2195 * performed, but instead the user specified motion vectors are used.
2197 * - encoding: Set by user.
2198 * - decoding: unused
2203 * Macroblock threshold below which the user specified macroblock types will be used.
2204 * - encoding: Set by user.
2205 * - decoding: unused
2210 * precision of the intra DC coefficient - 8
2211 * - encoding: Set by user.
2212 * - decoding: unused
2214 int intra_dc_precision;
2217 * noise vs. sse weight for the nsse comparsion function
2218 * - encoding: Set by user.
2219 * - decoding: unused
2224 * Number of macroblock rows at the top which are skipped.
2225 * - encoding: unused
2226 * - decoding: Set by user.
2231 * Number of macroblock rows at the bottom which are skipped.
2232 * - encoding: unused
2233 * - decoding: Set by user.
2239 * - encoding: Set by user.
2240 * - decoding: Set by libavcodec.
2243 #define FF_PROFILE_UNKNOWN -99
2244 #define FF_PROFILE_RESERVED -100
2246 #define FF_PROFILE_AAC_MAIN 0
2247 #define FF_PROFILE_AAC_LOW 1
2248 #define FF_PROFILE_AAC_SSR 2
2249 #define FF_PROFILE_AAC_LTP 3
2251 #define FF_PROFILE_DTS 20
2252 #define FF_PROFILE_DTS_ES 30
2253 #define FF_PROFILE_DTS_96_24 40
2254 #define FF_PROFILE_DTS_HD_HRA 50
2255 #define FF_PROFILE_DTS_HD_MA 60
2257 #define FF_PROFILE_MPEG2_422 0
2258 #define FF_PROFILE_MPEG2_HIGH 1
2259 #define FF_PROFILE_MPEG2_SS 2
2260 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2261 #define FF_PROFILE_MPEG2_MAIN 4
2262 #define FF_PROFILE_MPEG2_SIMPLE 5
2264 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2265 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2267 #define FF_PROFILE_H264_BASELINE 66
2268 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2269 #define FF_PROFILE_H264_MAIN 77
2270 #define FF_PROFILE_H264_EXTENDED 88
2271 #define FF_PROFILE_H264_HIGH 100
2272 #define FF_PROFILE_H264_HIGH_10 110
2273 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2274 #define FF_PROFILE_H264_HIGH_422 122
2275 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2276 #define FF_PROFILE_H264_HIGH_444 144
2277 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2278 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2279 #define FF_PROFILE_H264_CAVLC_444 44
2281 #define FF_PROFILE_VC1_SIMPLE 0
2282 #define FF_PROFILE_VC1_MAIN 1
2283 #define FF_PROFILE_VC1_COMPLEX 2
2284 #define FF_PROFILE_VC1_ADVANCED 3
2286 #define FF_PROFILE_MPEG4_SIMPLE 0
2287 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2288 #define FF_PROFILE_MPEG4_CORE 2
2289 #define FF_PROFILE_MPEG4_MAIN 3
2290 #define FF_PROFILE_MPEG4_N_BIT 4
2291 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2292 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2293 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2294 #define FF_PROFILE_MPEG4_HYBRID 8
2295 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2296 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2297 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2298 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2299 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2300 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2301 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2305 * - encoding: Set by user.
2306 * - decoding: Set by libavcodec.
2309 #define FF_LEVEL_UNKNOWN -99
2312 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2313 * - encoding: unused
2314 * - decoding: Set by user.
2319 * Bitstream width / height, may be different from width/height if lowres
2320 * or other things are used.
2321 * - encoding: unused
2322 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2324 int coded_width, coded_height;
2327 * frame skip threshold
2328 * - encoding: Set by user.
2329 * - decoding: unused
2331 int frame_skip_threshold;
2335 * - encoding: Set by user.
2336 * - decoding: unused
2338 int frame_skip_factor;
2341 * frame skip exponent
2342 * - encoding: Set by user.
2343 * - decoding: unused
2348 * frame skip comparison function
2349 * - encoding: Set by user.
2350 * - decoding: unused
2355 * Border processing masking, raises the quantizer for mbs on the borders
2357 * - encoding: Set by user.
2358 * - decoding: unused
2360 float border_masking;
2363 * minimum MB lagrange multipler
2364 * - encoding: Set by user.
2365 * - decoding: unused
2370 * maximum MB lagrange multipler
2371 * - encoding: Set by user.
2372 * - decoding: unused
2378 * - encoding: Set by user.
2379 * - decoding: unused
2381 int me_penalty_compensation;
2385 * - encoding: unused
2386 * - decoding: Set by user.
2388 enum AVDiscard skip_loop_filter;
2392 * - encoding: unused
2393 * - decoding: Set by user.
2395 enum AVDiscard skip_idct;
2399 * - encoding: unused
2400 * - decoding: Set by user.
2402 enum AVDiscard skip_frame;
2406 * - encoding: Set by user.
2407 * - decoding: unused
2413 * - encoding: Set by user.
2414 * - decoding: unused
2419 * constant rate factor - quality-based VBR - values ~correspond to qps
2420 * - encoding: Set by user.
2421 * - decoding: unused
2426 * constant quantization parameter rate control method
2427 * - encoding: Set by user.
2428 * - decoding: unused
2434 * - encoding: Set by user.
2435 * - decoding: unused
2440 * number of reference frames
2441 * - encoding: Set by user.
2442 * - decoding: Set by lavc.
2447 * chroma qp offset from luma
2448 * - encoding: Set by user.
2449 * - decoding: unused
2454 * Influences how often B-frames are used.
2455 * - encoding: Set by user.
2456 * - decoding: unused
2461 * trellis RD quantization
2462 * - encoding: Set by user.
2463 * - decoding: unused
2468 * Reduce fluctuations in qp (before curve compression).
2469 * - encoding: Set by user.
2470 * - decoding: unused
2472 float complexityblur;
2475 * in-loop deblocking filter alphac0 parameter
2476 * alpha is in the range -6...6
2477 * - encoding: Set by user.
2478 * - decoding: unused
2483 * in-loop deblocking filter beta parameter
2484 * beta is in the range -6...6
2485 * - encoding: Set by user.
2486 * - decoding: unused
2491 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2492 * - encoding: Set by user.
2493 * - decoding: unused
2496 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2497 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2498 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2499 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2500 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2503 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2504 * - encoding: Set by user.
2505 * - decoding: unused
2510 * Audio cutoff bandwidth (0 means "automatic")
2511 * - encoding: Set by user.
2512 * - decoding: unused
2517 * Multiplied by qscale for each frame and added to scene_change_score.
2518 * - encoding: Set by user.
2519 * - decoding: unused
2521 int scenechange_factor;
2525 * Note: Value depends upon the compare function used for fullpel ME.
2526 * - encoding: Set by user.
2527 * - decoding: unused
2532 * Adjusts sensitivity of b_frame_strategy 1.
2533 * - encoding: Set by user.
2534 * - decoding: unused
2539 * - encoding: Set by user.
2540 * - decoding: unused
2542 int compression_level;
2543 #define FF_COMPRESSION_DEFAULT -1
2546 * - encoding: Set by user.
2547 * - decoding: unused
2549 int min_prediction_order;
2552 * - encoding: Set by user.
2553 * - decoding: unused
2555 int max_prediction_order;
2557 #if FF_API_FLAC_GLOBAL_OPTS
2559 * @name FLAC options
2560 * @deprecated Use FLAC encoder private options instead.
2565 * LPC coefficient precision - used by FLAC encoder
2566 * - encoding: Set by user.
2567 * - decoding: unused
2569 attribute_deprecated int lpc_coeff_precision;
2572 * search method for selecting prediction order
2573 * - encoding: Set by user.
2574 * - decoding: unused
2576 attribute_deprecated int prediction_order_method;
2579 * - encoding: Set by user.
2580 * - decoding: unused
2582 attribute_deprecated int min_partition_order;
2585 * - encoding: Set by user.
2586 * - decoding: unused
2588 attribute_deprecated int max_partition_order;
2595 * GOP timecode frame start number, in non drop frame format
2596 * - encoding: Set by user.
2597 * - decoding: unused
2599 int64_t timecode_frame_start;
2601 #if FF_API_REQUEST_CHANNELS
2603 * Decoder should decode to this many channels if it can (0 for default)
2604 * - encoding: unused
2605 * - decoding: Set by user.
2606 * @deprecated Deprecated in favor of request_channel_layout.
2608 int request_channels;
2611 #if FF_API_DRC_SCALE
2613 * Percentage of dynamic range compression to be applied by the decoder.
2614 * The default value is 1.0, corresponding to full compression.
2615 * - encoding: unused
2616 * - decoding: Set by user.
2617 * @deprecated use AC3 decoder private option instead.
2619 attribute_deprecated float drc_scale;
2623 * opaque 64bit number (generally a PTS) that will be reordered and
2624 * output in AVFrame.reordered_opaque
2625 * @deprecated in favor of pkt_pts
2626 * - encoding: unused
2627 * - decoding: Set by user.
2629 int64_t reordered_opaque;
2632 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2633 * This field is applicable only when sample_fmt is AV_SAMPLE_FMT_S32.
2634 * - encoding: set by user.
2635 * - decoding: set by libavcodec.
2637 int bits_per_raw_sample;
2640 * Audio channel layout.
2641 * - encoding: set by user.
2642 * - decoding: set by user, may be overwritten by libavcodec.
2644 int64_t channel_layout;
2647 * Request decoder to use this channel layout if it can (0 for default)
2648 * - encoding: unused
2649 * - decoding: Set by user.
2651 int64_t request_channel_layout;
2654 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2655 * - encoding: Set by user.
2656 * - decoding: unused.
2658 float rc_max_available_vbv_use;
2661 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2662 * - encoding: Set by user.
2663 * - decoding: unused.
2665 float rc_min_vbv_overflow_use;
2668 * Hardware accelerator in use
2669 * - encoding: unused.
2670 * - decoding: Set by libavcodec
2672 struct AVHWAccel *hwaccel;
2675 * For some codecs, the time base is closer to the field rate than the frame rate.
2676 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2677 * if no telecine is used ...
2679 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2681 int ticks_per_frame;
2684 * Hardware accelerator context.
2685 * For some hardware accelerators, a global context needs to be
2686 * provided by the user. In that case, this holds display-dependent
2687 * data FFmpeg cannot instantiate itself. Please refer to the
2688 * FFmpeg HW accelerator documentation to know how to fill this
2689 * is. e.g. for VA API, this is a struct vaapi_context.
2690 * - encoding: unused
2691 * - decoding: Set by user
2693 void *hwaccel_context;
2696 * Chromaticity coordinates of the source primaries.
2697 * - encoding: Set by user
2698 * - decoding: Set by libavcodec
2700 enum AVColorPrimaries color_primaries;
2703 * Color Transfer Characteristic.
2704 * - encoding: Set by user
2705 * - decoding: Set by libavcodec
2707 enum AVColorTransferCharacteristic color_trc;
2710 * YUV colorspace type.
2711 * - encoding: Set by user
2712 * - decoding: Set by libavcodec
2714 enum AVColorSpace colorspace;
2717 * MPEG vs JPEG YUV range.
2718 * - encoding: Set by user
2719 * - decoding: Set by libavcodec
2721 enum AVColorRange color_range;
2724 * This defines the location of chroma samples.
2725 * - encoding: Set by user
2726 * - decoding: Set by libavcodec
2728 enum AVChromaLocation chroma_sample_location;
2731 * The codec may call this to execute several independent things.
2732 * It will return only after finishing all tasks.
2733 * The user may replace this with some multithreaded implementation,
2734 * the default implementation will execute the parts serially.
2735 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2736 * @param c context passed also to func
2737 * @param count the number of things to execute
2738 * @param arg2 argument passed unchanged to func
2739 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2740 * @param func function that will be called count times, with jobnr from 0 to count-1.
2741 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2742 * two instances of func executing at the same time will have the same threadnr.
2743 * @return always 0 currently, but code should handle a future improvement where when any call to func
2744 * returns < 0 no further calls to func may be done and < 0 is returned.
2745 * - encoding: Set by libavcodec, user can override.
2746 * - decoding: Set by libavcodec, user can override.
2748 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2751 * explicit P-frame weighted prediction analysis method
2753 * 1: fast blind weighting (one reference duplicate with -1 offset)
2754 * 2: smart weighting (full fade detection analysis)
2755 * - encoding: Set by user.
2756 * - decoding: unused
2758 int weighted_p_pred;
2763 * 1: Variance AQ (complexity mask)
2764 * 2: Auto-variance AQ (experimental)
2765 * - encoding: Set by user
2766 * - decoding: unused
2772 * Reduces blocking and blurring in flat and textured areas.
2773 * - encoding: Set by user
2774 * - decoding: unused
2780 * Strength of psychovisual optimization
2781 * - encoding: Set by user
2782 * - decoding: unused
2788 * Strength of psychovisual optimization
2789 * - encoding: Set by user
2790 * - decoding: unused
2796 * Number of frames for frametype and ratecontrol lookahead
2797 * - encoding: Set by user
2798 * - decoding: unused
2803 * Constant rate factor maximum
2804 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2805 * than crf_max, even if doing so would violate VBV restrictions.
2806 * - encoding: Set by user.
2807 * - decoding: unused
2811 int log_level_offset;
2813 #if FF_API_FLAC_GLOBAL_OPTS
2815 * Determines which LPC analysis algorithm to use.
2816 * - encoding: Set by user
2817 * - decoding: unused
2819 attribute_deprecated enum AVLPCType lpc_type;
2822 * Number of passes to use for Cholesky factorization during LPC analysis
2823 * - encoding: Set by user
2824 * - decoding: unused
2826 attribute_deprecated int lpc_passes;
2831 * Indicates number of picture subdivisions. Used for parallelized
2833 * - encoding: Set by user
2834 * - decoding: unused
2839 * Header containing style information for text subtitles.
2840 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2841 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2842 * the Format line following. It shouldn't include any Dialogue line.
2843 * - encoding: Set/allocated/freed by user (before avcodec_open())
2844 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2846 uint8_t *subtitle_header;
2847 int subtitle_header_size;
2850 * Current packet as passed into the decoder, to avoid having
2851 * to pass the packet into every function. Currently only valid
2852 * inside lavc and get/release_buffer callbacks.
2853 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2854 * - encoding: unused
2859 * Whether this is a copy of the context which had init() called on it.
2860 * This is used by multithreading - shared tables and picture pointers
2861 * should be freed from the original context only.
2862 * - encoding: Set by libavcodec.
2863 * - decoding: Set by libavcodec.
2868 * Which multithreading methods to use.
2869 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2870 * so clients which cannot provide future frames should not use it.
2872 * - encoding: Set by user, otherwise the default is used.
2873 * - decoding: Set by user, otherwise the default is used.
2876 #define FF_THREAD_FRAME 1 //< Decode more than one frame at once
2877 #define FF_THREAD_SLICE 2 //< Decode more than one part of a single frame at once
2880 * Which multithreading methods are in use by the codec.
2881 * - encoding: Set by libavcodec.
2882 * - decoding: Set by libavcodec.
2884 int active_thread_type;
2887 * Set by the client if its custom get_buffer() callback can be called
2888 * from another thread, which allows faster multithreaded decoding.
2889 * draw_horiz_band() will be called from other threads regardless of this setting.
2890 * Ignored if the default get_buffer() is used.
2891 * - encoding: Set by user.
2892 * - decoding: Set by user.
2894 int thread_safe_callbacks;
2897 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2898 * Used for compliant TS muxing.
2899 * - encoding: Set by libavcodec.
2900 * - decoding: unused.
2905 * Type of service that the audio stream conveys.
2906 * - encoding: Set by user.
2907 * - decoding: Set by libavcodec.
2909 enum AVAudioServiceType audio_service_type;
2912 * desired sample format
2913 * - encoding: Not used.
2914 * - decoding: Set by user.
2915 * Decoder will decode to this format if it can.
2917 enum AVSampleFormat request_sample_fmt;
2920 * Current statistics for PTS correction.
2921 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2922 * - encoding: unused
2924 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2925 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2926 int64_t pts_correction_last_pts; /// PTS of the last frame
2927 int64_t pts_correction_last_dts; /// DTS of the last frame
2935 typedef struct AVProfile {
2937 const char *name; ///< short name for the profile
2940 typedef struct AVCodecDefault AVCodecDefault;
2945 typedef struct AVCodec {
2947 * Name of the codec implementation.
2948 * The name is globally unique among encoders and among decoders (but an
2949 * encoder and a decoder can share the same name).
2950 * This is the primary way to find a codec from the user perspective.
2953 enum AVMediaType type;
2956 int (*init)(AVCodecContext *);
2957 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2958 int (*close)(AVCodecContext *);
2959 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2961 * Codec capabilities.
2965 struct AVCodec *next;
2968 * Will be called when seeking
2970 void (*flush)(AVCodecContext *);
2971 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2972 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2974 * Descriptive name for the codec, meant to be more human readable than name.
2975 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2977 const char *long_name;
2978 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2979 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2980 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2981 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2982 const AVClass *priv_class; ///< AVClass for the private context
2983 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2986 * @name Frame-level threading support functions
2990 * If defined, called on thread contexts when they are created.
2991 * If the codec allocates writable tables in init(), re-allocate them here.
2992 * priv_data will be set to a copy of the original.
2994 int (*init_thread_copy)(AVCodecContext *);
2996 * Copy necessary context variables from a previous thread context to the current one.
2997 * If not defined, the next thread will start automatically; otherwise, the codec
2998 * must call ff_thread_finish_setup().
3000 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3002 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3006 * Private codec-specific defaults.
3008 const AVCodecDefault *defaults;
3014 typedef struct AVHWAccel {
3016 * Name of the hardware accelerated codec.
3017 * The name is globally unique among encoders and among decoders (but an
3018 * encoder and a decoder can share the same name).
3023 * Type of codec implemented by the hardware accelerator.
3025 * See AVMEDIA_TYPE_xxx
3027 enum AVMediaType type;
3030 * Codec implemented by the hardware accelerator.
3037 * Supported pixel format.
3039 * Only hardware accelerated formats are supported here.
3041 enum PixelFormat pix_fmt;
3044 * Hardware accelerated codec capabilities.
3045 * see FF_HWACCEL_CODEC_CAP_*
3049 struct AVHWAccel *next;
3052 * Called at the beginning of each frame or field picture.
3054 * Meaningful frame information (codec specific) is guaranteed to
3055 * be parsed at this point. This function is mandatory.
3057 * Note that buf can be NULL along with buf_size set to 0.
3058 * Otherwise, this means the whole frame is available at this point.
3060 * @param avctx the codec context
3061 * @param buf the frame data buffer base
3062 * @param buf_size the size of the frame in bytes
3063 * @return zero if successful, a negative value otherwise
3065 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3068 * Callback for each slice.
3070 * Meaningful slice information (codec specific) is guaranteed to
3071 * be parsed at this point. This function is mandatory.
3073 * @param avctx the codec context
3074 * @param buf the slice data buffer base
3075 * @param buf_size the size of the slice in bytes
3076 * @return zero if successful, a negative value otherwise
3078 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3081 * Called at the end of each frame or field picture.
3083 * The whole picture is parsed at this point and can now be sent
3084 * to the hardware accelerator. This function is mandatory.
3086 * @param avctx the codec context
3087 * @return zero if successful, a negative value otherwise
3089 int (*end_frame)(AVCodecContext *avctx);
3092 * Size of HW accelerator private data.
3094 * Private data is allocated with av_mallocz() before
3095 * AVCodecContext.get_buffer() and deallocated after
3096 * AVCodecContext.release_buffer().
3102 * four components are given, that's all.
3103 * the last component is alpha
3105 typedef struct AVPicture {
3107 int linesize[4]; ///< number of bytes per line
3110 #if FF_API_PALETTE_CONTROL
3113 * This structure defines a method for communicating palette changes
3114 * between and demuxer and a decoder.
3116 * @deprecated Use AVPacket to send palette changes instead.
3117 * This is totally broken.
3119 #define AVPALETTE_SIZE 1024
3120 #define AVPALETTE_COUNT 256
3121 typedef struct AVPaletteControl {
3123 /* Demuxer sets this to 1 to indicate the palette has changed;
3124 * decoder resets to 0. */
3125 int palette_changed;
3127 /* 4-byte ARGB palette entries, stored in native byte order; note that
3128 * the individual palette components should be on a 8-bit scale; if
3129 * the palette data comes from an IBM VGA native format, the component
3130 * data is probably 6 bits in size and needs to be scaled. */
3131 unsigned int palette[AVPALETTE_COUNT];
3133 } AVPaletteControl attribute_deprecated;
3136 enum AVSubtitleType {
3139 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3142 * Plain text, the text field must be set by the decoder and is
3143 * authoritative. ass and pict fields may contain approximations.
3148 * Formatted text, the ass field must be set by the decoder and is
3149 * authoritative. pict and text fields may contain approximations.
3154 typedef struct AVSubtitleRect {
3155 int x; ///< top left corner of pict, undefined when pict is not set
3156 int y; ///< top left corner of pict, undefined when pict is not set
3157 int w; ///< width of pict, undefined when pict is not set
3158 int h; ///< height of pict, undefined when pict is not set
3159 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3162 * data+linesize for the bitmap of this subtitle.
3163 * can be set for text/ass as well once they where rendered
3166 enum AVSubtitleType type;
3168 char *text; ///< 0 terminated plain UTF-8 text
3171 * 0 terminated ASS/SSA compatible event line.
3172 * The pressentation of this is unaffected by the other values in this
3178 typedef struct AVSubtitle {
3179 uint16_t format; /* 0 = graphics */
3180 uint32_t start_display_time; /* relative to packet pts, in ms */
3181 uint32_t end_display_time; /* relative to packet pts, in ms */
3183 AVSubtitleRect **rects;
3184 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3187 /* packet functions */
3190 * @deprecated use NULL instead
3192 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3195 * Default packet destructor.
3197 void av_destruct_packet(AVPacket *pkt);
3200 * Initialize optional fields of a packet with default values.
3204 void av_init_packet(AVPacket *pkt);
3207 * Allocate the payload of a packet and initialize its fields with
3211 * @param size wanted payload size
3212 * @return 0 if OK, AVERROR_xxx otherwise
3214 int av_new_packet(AVPacket *pkt, int size);
3217 * Reduce packet size, correctly zeroing padding
3220 * @param size new size
3222 void av_shrink_packet(AVPacket *pkt, int size);
3225 * Increase packet size, correctly zeroing padding
3228 * @param grow_by number of bytes by which to increase the size of the packet
3230 int av_grow_packet(AVPacket *pkt, int grow_by);
3233 * @warning This is a hack - the packet memory allocation stuff is broken. The
3234 * packet is allocated if it was not really allocated.
3236 int av_dup_packet(AVPacket *pkt);
3241 * @param pkt packet to free
3243 void av_free_packet(AVPacket *pkt);
3246 * Allocate new information of a packet.
3249 * @param type side information type
3250 * @param size side information size
3251 * @return pointer to fresh allocated data or NULL otherwise
3253 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3257 * Get side information from packet.
3260 * @param type desired side information type
3261 * @param size pointer for side information size to store (optional)
3262 * @return pointer to data if present or NULL otherwise
3264 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3267 int av_packet_merge_side_data(AVPacket *pkt);
3269 int av_packet_split_side_data(AVPacket *pkt);
3274 struct ReSampleContext;
3275 struct AVResampleContext;
3277 typedef struct ReSampleContext ReSampleContext;
3280 * Initialize audio resampling context.
3282 * @param output_channels number of output channels
3283 * @param input_channels number of input channels
3284 * @param output_rate output sample rate
3285 * @param input_rate input sample rate
3286 * @param sample_fmt_out requested output sample format
3287 * @param sample_fmt_in input sample format
3288 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3289 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3290 * @param linear if 1 then the used FIR filter will be linearly interpolated
3291 between the 2 closest, if 0 the closest will be used
3292 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3293 * @return allocated ReSampleContext, NULL if error occured
3295 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3296 int output_rate, int input_rate,
3297 enum AVSampleFormat sample_fmt_out,
3298 enum AVSampleFormat sample_fmt_in,
3299 int filter_length, int log2_phase_count,
3300 int linear, double cutoff);
3302 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3305 * Free resample context.
3307 * @param s a non-NULL pointer to a resample context previously
3308 * created with av_audio_resample_init()
3310 void audio_resample_close(ReSampleContext *s);
3314 * Initialize an audio resampler.
3315 * Note, if either rate is not an integer then simply scale both rates up so they are.
3316 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3317 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3318 * @param linear If 1 then the used FIR filter will be linearly interpolated
3319 between the 2 closest, if 0 the closest will be used
3320 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3322 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3325 * Resample an array of samples using a previously configured context.
3326 * @param src an array of unconsumed samples
3327 * @param consumed the number of samples of src which have been consumed are returned here
3328 * @param src_size the number of unconsumed samples available
3329 * @param dst_size the amount of space in samples available in dst
3330 * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
3331 * @return the number of samples written in dst or -1 if an error occurred
3333 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3337 * Compensate samplerate/timestamp drift. The compensation is done by changing
3338 * the resampler parameters, so no audible clicks or similar distortions occur
3339 * @param compensation_distance distance in output samples over which the compensation should be performed
3340 * @param sample_delta number of output samples which should be output less
3342 * example: av_resample_compensate(c, 10, 500)
3343 * here instead of 510 samples only 500 samples would be output
3345 * note, due to rounding the actual compensation might be slightly different,
3346 * especially if the compensation_distance is large and the in_rate used during init is small
3348 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3349 void av_resample_close(struct AVResampleContext *c);
3352 * Allocate memory for a picture. Call avpicture_free() to free it.
3354 * @see avpicture_fill()
3356 * @param picture the picture to be filled in
3357 * @param pix_fmt the format of the picture
3358 * @param width the width of the picture
3359 * @param height the height of the picture
3360 * @return zero if successful, a negative value if not
3362 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3365 * Free a picture previously allocated by avpicture_alloc().
3366 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3369 * @param picture the AVPicture to be freed
3371 void avpicture_free(AVPicture *picture);
3374 * Fill in the AVPicture fields.
3375 * The fields of the given AVPicture are filled in by using the 'ptr' address
3376 * which points to the image data buffer. Depending on the specified picture
3377 * format, one or multiple image data pointers and line sizes will be set.
3378 * If a planar format is specified, several pointers will be set pointing to
3379 * the different picture planes and the line sizes of the different planes
3380 * will be stored in the lines_sizes array.
3381 * Call with ptr == NULL to get the required size for the ptr buffer.
3383 * To allocate the buffer and fill in the AVPicture fields in one call,
3384 * use avpicture_alloc().
3386 * @param picture AVPicture whose fields are to be filled in
3387 * @param ptr Buffer which will contain or contains the actual image data
3388 * @param pix_fmt The format in which the picture data is stored.
3389 * @param width the width of the image in pixels
3390 * @param height the height of the image in pixels
3391 * @return size of the image data in bytes
3393 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3394 enum PixelFormat pix_fmt, int width, int height);
3397 * Copy pixel data from an AVPicture into a buffer.
3398 * The data is stored compactly, without any gaps for alignment or padding
3399 * which may be applied by avpicture_fill().
3401 * @see avpicture_get_size()
3403 * @param[in] src AVPicture containing image data
3404 * @param[in] pix_fmt The format in which the picture data is stored.
3405 * @param[in] width the width of the image in pixels.
3406 * @param[in] height the height of the image in pixels.
3407 * @param[out] dest A buffer into which picture data will be copied.
3408 * @param[in] dest_size The size of 'dest'.
3409 * @return The number of bytes written to dest, or a negative value (error code) on error.
3411 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3412 unsigned char *dest, int dest_size);
3415 * Calculate the size in bytes that a picture of the given width and height
3416 * would occupy if stored in the given picture format.
3417 * Note that this returns the size of a compact representation as generated
3418 * by avpicture_layout(), which can be smaller than the size required for e.g.
3421 * @param pix_fmt the given picture format
3422 * @param width the width of the image
3423 * @param height the height of the image
3424 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3426 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3427 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3429 #if FF_API_GET_PIX_FMT_NAME
3431 * Return the short name for a pixel format.
3433 * \see av_get_pix_fmt(), av_get_pix_fmt_string().
3434 * @deprecated Deprecated in favor of av_get_pix_fmt_name().
3436 attribute_deprecated
3437 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3440 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3443 * Return a value representing the fourCC code associated to the
3444 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3447 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3450 * Put a string representing the codec tag codec_tag in buf.
3452 * @param buf_size size in bytes of buf
3453 * @return the length of the string that would have been generated if
3454 * enough space had been available, excluding the trailing null
3456 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3458 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3459 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3460 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3461 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3462 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3463 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3466 * Compute what kind of losses will occur when converting from one specific
3467 * pixel format to another.
3468 * When converting from one pixel format to another, information loss may occur.
3469 * For example, when converting from RGB24 to GRAY, the color information will
3470 * be lost. Similarly, other losses occur when converting from some formats to
3471 * other formats. These losses can involve loss of chroma, but also loss of
3472 * resolution, loss of color depth, loss due to the color space conversion, loss
3473 * of the alpha bits or loss due to color quantization.
3474 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3475 * which will occur when converting from one pixel format to another.
3477 * @param[in] dst_pix_fmt destination pixel format
3478 * @param[in] src_pix_fmt source pixel format
3479 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3480 * @return Combination of flags informing you what kind of losses will occur.
3482 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3486 * Find the best pixel format to convert to given a certain source pixel
3487 * format. When converting from one pixel format to another, information loss
3488 * may occur. For example, when converting from RGB24 to GRAY, the color
3489 * information will be lost. Similarly, other losses occur when converting from
3490 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3491 * the given pixel formats should be used to suffer the least amount of loss.
3492 * The pixel formats from which it chooses one, are determined by the
3493 * pix_fmt_mask parameter.
3496 * src_pix_fmt = PIX_FMT_YUV420P;
3497 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3498 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3501 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3502 * @param[in] src_pix_fmt source pixel format
3503 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3504 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3505 * @return The best pixel format to convert to or -1 if none was found.
3507 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3508 int has_alpha, int *loss_ptr);
3510 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3511 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3514 * Tell if an image really has transparent alpha values.
3515 * @return ored mask of FF_ALPHA_xxx constants
3517 int img_get_alpha_info(const AVPicture *src,
3518 enum PixelFormat pix_fmt, int width, int height);
3520 /* deinterlace a picture */
3521 /* deinterlace - if not supported return -1 */
3522 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3523 enum PixelFormat pix_fmt, int width, int height);
3525 /* external high level API */
3528 * If c is NULL, returns the first registered codec,
3529 * if c is non-NULL, returns the next registered codec after c,
3530 * or NULL if c is the last one.
3532 AVCodec *av_codec_next(AVCodec *c);
3535 * Return the LIBAVCODEC_VERSION_INT constant.
3537 unsigned avcodec_version(void);
3540 * Return the libavcodec build-time configuration.
3542 const char *avcodec_configuration(void);
3545 * Return the libavcodec license.
3547 const char *avcodec_license(void);
3550 * Initialize libavcodec.
3551 * If called more than once, does nothing.
3553 * @warning This function must be called before any other libavcodec
3556 * @warning This function is not thread-safe.
3558 void avcodec_init(void);
3561 * Register the codec codec and initialize libavcodec.
3563 * @see avcodec_init(), avcodec_register_all()
3565 void avcodec_register(AVCodec *codec);
3568 * Find a registered encoder with a matching codec ID.
3570 * @param id CodecID of the requested encoder
3571 * @return An encoder if one was found, NULL otherwise.
3573 AVCodec *avcodec_find_encoder(enum CodecID id);
3576 * Find a registered encoder with the specified name.
3578 * @param name name of the requested encoder
3579 * @return An encoder if one was found, NULL otherwise.
3581 AVCodec *avcodec_find_encoder_by_name(const char *name);
3584 * Find a registered decoder with a matching codec ID.
3586 * @param id CodecID of the requested decoder
3587 * @return A decoder if one was found, NULL otherwise.
3589 AVCodec *avcodec_find_decoder(enum CodecID id);
3592 * Find a registered decoder with the specified name.
3594 * @param name name of the requested decoder
3595 * @return A decoder if one was found, NULL otherwise.
3597 AVCodec *avcodec_find_decoder_by_name(const char *name);
3598 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3601 * Return a name for the specified profile, if available.
3603 * @param codec the codec that is searched for the given profile
3604 * @param profile the profile value for which a name is requested
3605 * @return A name for the profile if found, NULL otherwise.
3607 const char *av_get_profile_name(const AVCodec *codec, int profile);
3610 * Set the fields of the given AVCodecContext to default values.
3612 * @param s The AVCodecContext of which the fields should be set to default values.
3614 void avcodec_get_context_defaults(AVCodecContext *s);
3616 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3617 * we WILL change its arguments and name a few times! */
3618 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3620 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3621 * we WILL change its arguments and name a few times! */
3622 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3624 #if FF_API_ALLOC_CONTEXT
3626 * Allocate an AVCodecContext and set its fields to default values. The
3627 * resulting struct can be deallocated by simply calling av_free().
3629 * @return An AVCodecContext filled with default values or NULL on failure.
3630 * @see avcodec_get_context_defaults
3632 * @deprecated use avcodec_alloc_context3()
3634 attribute_deprecated
3635 AVCodecContext *avcodec_alloc_context(void);
3637 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3638 * we WILL change its arguments and name a few times! */
3639 attribute_deprecated
3640 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3644 * Allocate an AVCodecContext and set its fields to default values. The
3645 * resulting struct can be deallocated by simply calling av_free().
3647 * @param codec if non-NULL, allocate private data and initialize defaults
3648 * for the given codec. It is illegal to then call avcodec_open()
3649 * with a different codec.
3651 * @return An AVCodecContext filled with default values or NULL on failure.
3652 * @see avcodec_get_context_defaults
3654 * @deprecated use avcodec_alloc_context3()
3656 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3659 * Copy the settings of the source AVCodecContext into the destination
3660 * AVCodecContext. The resulting destination codec context will be
3661 * unopened, i.e. you are required to call avcodec_open() before you
3662 * can use this AVCodecContext to decode/encode video/audio data.
3664 * @param dest target codec context, should be initialized with
3665 * avcodec_alloc_context3(), but otherwise uninitialized
3666 * @param src source codec context
3667 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3669 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3672 * Set the fields of the given AVFrame to default values.
3674 * @param pic The AVFrame of which the fields should be set to default values.
3676 void avcodec_get_frame_defaults(AVFrame *pic);
3679 * Allocate an AVFrame and set its fields to default values. The resulting
3680 * struct can be deallocated by simply calling av_free().
3682 * @return An AVFrame filled with default values or NULL on failure.
3683 * @see avcodec_get_frame_defaults
3685 AVFrame *avcodec_alloc_frame(void);
3687 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3688 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3689 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3692 * Return the amount of padding in pixels which the get_buffer callback must
3693 * provide around the edge of the image for codecs which do not have the
3694 * CODEC_FLAG_EMU_EDGE flag.
3696 * @return Required padding in pixels.
3698 unsigned avcodec_get_edge_width(void);
3700 * Modify width and height values so that they will result in a memory
3701 * buffer that is acceptable for the codec if you do not use any horizontal
3704 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3705 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3706 * according to avcodec_get_edge_width() before.
3708 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3710 * Modify width and height values so that they will result in a memory
3711 * buffer that is acceptable for the codec if you also ensure that all
3712 * line sizes are a multiple of the respective linesize_align[i].
3714 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3715 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3716 * according to avcodec_get_edge_width() before.
3718 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3719 int linesize_align[4]);
3721 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3723 #if FF_API_THREAD_INIT
3725 * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
3727 attribute_deprecated
3728 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3731 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3732 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3733 //FIXME func typedef
3735 #if FF_API_AVCODEC_OPEN
3737 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3738 * function the context has to be allocated.
3740 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3741 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3742 * retrieving a codec.
3744 * @warning This function is not thread safe!
3747 * avcodec_register_all();
3748 * codec = avcodec_find_decoder(CODEC_ID_H264);
3752 * context = avcodec_alloc_context3(codec);
3754 * if (avcodec_open(context, codec) < 0)
3758 * @param avctx The context which will be set up to use the given codec.
3759 * @param codec The codec to use within the context.
3760 * @return zero on success, a negative value on error
3761 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3763 * @deprecated use avcodec_open2
3765 attribute_deprecated
3766 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3770 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3771 * function the context has to be allocated with avcodec_alloc_context().
3773 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3774 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3775 * retrieving a codec.
3777 * @warning This function is not thread safe!
3780 * avcodec_register_all();
3781 * av_dict_set(&opts, "b", "2.5M", 0);
3782 * codec = avcodec_find_decoder(CODEC_ID_H264);
3786 * context = avcodec_alloc_context();
3788 * if (avcodec_open(context, codec, opts) < 0)
3792 * @param avctx The context to initialize.
3793 * @param options A dictionary filled with AVCodecContext and codec-private options.
3794 * On return this object will be filled with options that were not found.
3796 * @return zero on success, a negative value on error
3797 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3798 * av_dict_set(), av_opt_find().
3800 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3803 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3804 * Some decoders may support multiple frames in a single AVPacket, such
3805 * decoders would then just decode the first frame. In this case,
3806 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3807 * the remaining data in order to decode the second frame etc.
3809 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3810 * decompressed frame size in bytes.
3812 * @warning You must set frame_size_ptr to the allocated size of the
3813 * output buffer before calling avcodec_decode_audio3().
3815 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3816 * the actual read bytes because some optimized bitstream readers read 32 or 64
3817 * bits at once and could read over the end.
3819 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3820 * no overreading happens for damaged MPEG streams.
3822 * @note You might have to align the input buffer avpkt->data and output buffer
3823 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3824 * necessary at all, on others it won't work at all if not aligned and on others
3825 * it will work but it will have an impact on performance.
3827 * In practice, avpkt->data should have 4 byte alignment at minimum and
3828 * samples should be 16 byte aligned unless the CPU doesn't need it
3829 * (AltiVec and SSE do).
3831 * @param avctx the codec context
3832 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3833 * @param[in,out] frame_size_ptr the output buffer size in bytes
3834 * @param[in] avpkt The input AVPacket containing the input buffer.
3835 * You can create such packet with av_init_packet() and by then setting
3836 * data and size, some decoders might in addition need other fields.
3837 * All decoders are designed to use the least fields possible though.
3838 * @return On error a negative value is returned, otherwise the number of bytes
3839 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3841 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3842 int *frame_size_ptr,
3846 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3847 * Some decoders may support multiple frames in a single AVPacket, such
3848 * decoders would then just decode the first frame.
3850 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3851 * the actual read bytes because some optimized bitstream readers read 32 or 64
3852 * bits at once and could read over the end.
3854 * @warning The end of the input buffer buf should be set to 0 to ensure that
3855 * no overreading happens for damaged MPEG streams.
3857 * @note You might have to align the input buffer avpkt->data.
3858 * The alignment requirements depend on the CPU: on some CPUs it isn't
3859 * necessary at all, on others it won't work at all if not aligned and on others
3860 * it will work but it will have an impact on performance.
3862 * In practice, avpkt->data should have 4 byte alignment at minimum.
3864 * @note Some codecs have a delay between input and output, these need to be
3865 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3867 * @param avctx the codec context
3868 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3869 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3870 * allocate memory for the actual bitmap.
3871 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3872 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3873 * decodes and the decoder tells the user once it does not need the data anymore,
3874 * the user app can at this point free/reuse/keep the memory as it sees fit.
3876 * @param[in] avpkt The input AVpacket containing the input buffer.
3877 * You can create such packet with av_init_packet() and by then setting
3878 * data and size, some decoders might in addition need other fields like
3879 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3881 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3882 * @return On error a negative value is returned, otherwise the number of bytes
3883 * used or zero if no frame could be decompressed.
3885 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3886 int *got_picture_ptr,
3890 * Decode a subtitle message.
3891 * Return a negative value on error, otherwise return the number of bytes used.
3892 * If no subtitle could be decompressed, got_sub_ptr is zero.
3893 * Otherwise, the subtitle is stored in *sub.
3894 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3895 * simplicity, because the performance difference is expect to be negligible
3896 * and reusing a get_buffer written for video codecs would probably perform badly
3897 * due to a potentially very different allocation pattern.
3899 * @param avctx the codec context
3900 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3901 freed with avsubtitle_free if *got_sub_ptr is set.
3902 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3903 * @param[in] avpkt The input AVPacket containing the input buffer.
3905 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3910 * Frees all allocated data in the given subtitle struct.
3912 * @param sub AVSubtitle to free.
3914 void avsubtitle_free(AVSubtitle *sub);
3916 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3918 uint8_t *buf, int buf_size);
3921 * Encode an audio frame from samples into buf.
3923 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3924 * However, for PCM audio the user will know how much space is needed
3925 * because it depends on the value passed in buf_size as described
3926 * below. In that case a lower value can be used.
3928 * @param avctx the codec context
3929 * @param[out] buf the output buffer
3930 * @param[in] buf_size the output buffer size
3931 * @param[in] samples the input buffer containing the samples
3932 * The number of samples read from this buffer is frame_size*channels,
3933 * both of which are defined in avctx.
3934 * For PCM audio the number of samples read from samples is equal to
3935 * buf_size * input_sample_size / output_sample_size.
3936 * @return On error a negative value is returned, on success zero or the number
3937 * of bytes used to encode the data read from the input buffer.
3939 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3940 const short *samples);
3943 * Encode a video frame from pict into buf.
3944 * The input picture should be
3945 * stored using a specific format, namely avctx.pix_fmt.
3947 * @param avctx the codec context
3948 * @param[out] buf the output buffer for the bitstream of encoded frame
3949 * @param[in] buf_size the size of the output buffer in bytes
3950 * @param[in] pict the input picture to encode
3951 * @return On error a negative value is returned, on success zero or the number
3952 * of bytes used from the output buffer.
3954 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3955 const AVFrame *pict);
3956 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3957 const AVSubtitle *sub);
3959 int avcodec_close(AVCodecContext *avctx);
3962 * Register all the codecs, parsers and bitstream filters which were enabled at
3963 * configuration time. If you do not call this function you can select exactly
3964 * which formats you want to support, by using the individual registration
3967 * @see avcodec_register
3968 * @see av_register_codec_parser
3969 * @see av_register_bitstream_filter
3971 void avcodec_register_all(void);
3974 * Flush buffers, should be called when seeking or when switching to a different stream.
3976 void avcodec_flush_buffers(AVCodecContext *avctx);
3978 void avcodec_default_free_buffers(AVCodecContext *s);
3980 /* misc useful functions */
3982 #if FF_API_OLD_FF_PICT_TYPES
3984 * Return a single letter to describe the given picture type pict_type.
3986 * @param[in] pict_type the picture type
3987 * @return A single character representing the picture type.
3988 * @deprecated Use av_get_picture_type_char() instead.
3990 attribute_deprecated
3991 char av_get_pict_type_char(int pict_type);
3995 * Return codec bits per sample.
3997 * @param[in] codec_id the codec
3998 * @return Number of bits per sample or zero if unknown for the given codec.
4000 int av_get_bits_per_sample(enum CodecID codec_id);
4002 #if FF_API_OLD_SAMPLE_FMT
4004 * @deprecated Use av_get_bytes_per_sample() instead.
4006 attribute_deprecated
4007 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
4011 typedef struct AVCodecParserContext {
4013 struct AVCodecParser *parser;
4014 int64_t frame_offset; /* offset of the current frame */
4015 int64_t cur_offset; /* current offset
4016 (incremented by each av_parser_parse()) */
4017 int64_t next_frame_offset; /* offset of the next frame */
4019 int pict_type; /* XXX: Put it back in AVCodecContext. */
4021 * This field is used for proper frame duration computation in lavf.
4022 * It signals, how much longer the frame duration of the current frame
4023 * is compared to normal frame duration.
4025 * frame_duration = (1 + repeat_pict) * time_base
4027 * It is used by codecs like H.264 to display telecined material.
4029 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4030 int64_t pts; /* pts of the current frame */
4031 int64_t dts; /* dts of the current frame */
4036 int fetch_timestamp;
4038 #define AV_PARSER_PTS_NB 4
4039 int cur_frame_start_index;
4040 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4041 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4042 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4045 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4046 #define PARSER_FLAG_ONCE 0x0002
4047 /// Set if the parser has a valid file offset
4048 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4050 int64_t offset; ///< byte offset from starting packet start
4051 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4054 * Set by parser to 1 for key frames and 0 for non-key frames.
4055 * It is initialized to -1, so if the parser doesn't set this flag,
4056 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4062 * Time difference in stream time base units from the pts of this
4063 * packet to the point at which the output from the decoder has converged
4064 * independent from the availability of previous frames. That is, the
4065 * frames are virtually identical no matter if decoding started from
4066 * the very first frame or from this keyframe.
4067 * Is AV_NOPTS_VALUE if unknown.
4068 * This field is not the display duration of the current frame.
4069 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4072 * The purpose of this field is to allow seeking in streams that have no
4073 * keyframes in the conventional sense. It corresponds to the
4074 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4075 * essential for some types of subtitle streams to ensure that all
4076 * subtitles are correctly displayed after seeking.
4078 int64_t convergence_duration;
4080 // Timestamp generation support:
4082 * Synchronization point for start of timestamp generation.
4084 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4087 * For example, this corresponds to presence of H.264 buffering period
4093 * Offset of the current timestamp against last timestamp sync point in
4094 * units of AVCodecContext.time_base.
4096 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4097 * contain a valid timestamp offset.
4099 * Note that the timestamp of sync point has usually a nonzero
4100 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4101 * the next frame after timestamp sync point will be usually 1.
4103 * For example, this corresponds to H.264 cpb_removal_delay.
4105 int dts_ref_dts_delta;
4108 * Presentation delay of current frame in units of AVCodecContext.time_base.
4110 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4111 * contain valid non-negative timestamp delta (presentation time of a frame
4112 * must not lie in the past).
4114 * This delay represents the difference between decoding and presentation
4115 * time of the frame.
4117 * For example, this corresponds to H.264 dpb_output_delay.
4122 * Position of the packet in file.
4124 * Analogous to cur_frame_pts/dts
4126 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4129 * Byte position of currently parsed frame in stream.
4134 * Previous frame byte position.
4137 } AVCodecParserContext;
4139 typedef struct AVCodecParser {
4140 int codec_ids[5]; /* several codec IDs are permitted */
4142 int (*parser_init)(AVCodecParserContext *s);
4143 int (*parser_parse)(AVCodecParserContext *s,
4144 AVCodecContext *avctx,
4145 const uint8_t **poutbuf, int *poutbuf_size,
4146 const uint8_t *buf, int buf_size);
4147 void (*parser_close)(AVCodecParserContext *s);
4148 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4149 struct AVCodecParser *next;
4152 AVCodecParser *av_parser_next(AVCodecParser *c);
4154 void av_register_codec_parser(AVCodecParser *parser);
4155 AVCodecParserContext *av_parser_init(int codec_id);
4160 * @param s parser context.
4161 * @param avctx codec context.
4162 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4163 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4164 * @param buf input buffer.
4165 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4166 * @param pts input presentation timestamp.
4167 * @param dts input decoding timestamp.
4168 * @param pos input byte position in stream.
4169 * @return the number of bytes of the input bitstream used.
4174 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4181 * decode_frame(data, size);
4185 int av_parser_parse2(AVCodecParserContext *s,
4186 AVCodecContext *avctx,
4187 uint8_t **poutbuf, int *poutbuf_size,
4188 const uint8_t *buf, int buf_size,
4189 int64_t pts, int64_t dts,
4192 int av_parser_change(AVCodecParserContext *s,
4193 AVCodecContext *avctx,
4194 uint8_t **poutbuf, int *poutbuf_size,
4195 const uint8_t *buf, int buf_size, int keyframe);
4196 void av_parser_close(AVCodecParserContext *s);
4199 typedef struct AVBitStreamFilterContext {
4201 struct AVBitStreamFilter *filter;
4202 AVCodecParserContext *parser;
4203 struct AVBitStreamFilterContext *next;
4204 } AVBitStreamFilterContext;
4207 typedef struct AVBitStreamFilter {
4210 int (*filter)(AVBitStreamFilterContext *bsfc,
4211 AVCodecContext *avctx, const char *args,
4212 uint8_t **poutbuf, int *poutbuf_size,
4213 const uint8_t *buf, int buf_size, int keyframe);
4214 void (*close)(AVBitStreamFilterContext *bsfc);
4215 struct AVBitStreamFilter *next;
4216 } AVBitStreamFilter;
4218 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4219 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4220 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4221 AVCodecContext *avctx, const char *args,
4222 uint8_t **poutbuf, int *poutbuf_size,
4223 const uint8_t *buf, int buf_size, int keyframe);
4224 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4226 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4231 * Reallocate the given block if it is not large enough, otherwise do nothing.
4235 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4238 * Allocate a buffer, reusing the given one if large enough.
4240 * Contrary to av_fast_realloc the current buffer contents might not be
4241 * preserved and on error the old buffer is freed, thus no special
4242 * handling to avoid memleaks is necessary.
4244 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4245 * @param size size of the buffer *ptr points to
4246 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4247 * *size 0 if an error occurred.
4249 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4252 * Copy image src to dst. Wraps av_picture_data_copy() above.
4254 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4255 enum PixelFormat pix_fmt, int width, int height);
4258 * Crop image top and left side.
4260 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4261 enum PixelFormat pix_fmt, int top_band, int left_band);
4266 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4267 int padtop, int padbottom, int padleft, int padright, int *color);
4270 * Encode extradata length to a buffer. Used by xiph codecs.
4272 * @param s buffer to write to; must be at least (v/255+1) bytes long
4273 * @param v size of extradata in bytes
4274 * @return number of bytes written to the buffer.
4276 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4279 * Logs a generic warning message about a missing feature. This function is
4280 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4281 * only, and would normally not be used by applications.
4282 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4283 * a pointer to an AVClass struct
4284 * @param[in] feature string containing the name of the missing feature
4285 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4286 * If want_sample is non-zero, additional verbage will be added to the log
4287 * message which tells the user how to report samples to the development
4290 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4293 * Log a generic warning message asking for a sample. This function is
4294 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4295 * only, and would normally not be used by applications.
4296 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4297 * a pointer to an AVClass struct
4298 * @param[in] msg string containing an optional message, or NULL if no message
4300 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4303 * Register the hardware accelerator hwaccel.
4305 void av_register_hwaccel(AVHWAccel *hwaccel);
4308 * If hwaccel is NULL, returns the first registered hardware accelerator,
4309 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4310 * after hwaccel, or NULL if hwaccel is the last one.
4312 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4316 * Lock operation used by lockmgr
4319 AV_LOCK_CREATE, ///< Create a mutex
4320 AV_LOCK_OBTAIN, ///< Lock the mutex
4321 AV_LOCK_RELEASE, ///< Unlock the mutex
4322 AV_LOCK_DESTROY, ///< Free mutex resources
4326 * Register a user provided lock manager supporting the operations
4327 * specified by AVLockOp. mutex points to a (void *) where the
4328 * lockmgr should store/get a pointer to a user allocated mutex. It's
4329 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4331 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4332 * callback during the call to av_lockmgr_register().
4333 * Thus, the application must be prepared to handle that.
4334 * If cb is set to NULL the lockmgr will be unregistered.
4335 * Also note that during unregistration the previously registered
4336 * lockmgr callback may also be invoked.
4338 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4340 #endif /* AVCODEC_AVCODEC_H */